From: Rado Vasilev (decklandv@gmail.com)
Date: Tue Aug 05 2008 - 03:35:27 ART
Hi,
Your CE's use the same BGP AS# and therefore your CE1 router rejects the
routes sent from PE1 as they contain its own AS# in the AS_PATH.
You have to use neighbor .... as-override on both PE's connections to
the customer edge...
Regards,
Rado
> Hello all gentelman!
>
> Here is my topology.And I am trying to build MPLS VPN. I want to advertise
> routes from both CEs to each other across MPLS backbone.
>
> CE1------PE1-----Core1------Core2------PE2------CE2
>
> PE & CE are eBGP neighbor.
>
> Route from CE2 advertise to until PE1. But PE1 seems don't re-advertise
> route from CE2 to CE1.
>
> PE1#sh ip bgp vpnv4 all neighbors 172.16.1.2 advertised-routes
> BGP table version is 10, local router ID is 1.1.1.3
> Status codes: s suppressed, d damped, h history, * valid, > best, i -
> internal,
> r RIB-failure, S Stale
> Origin codes: i - IGP, e - EGP, ? - incomplete
> Network Next Hop Metric LocPrf Weight Path
> Route Distinguisher: 64512:1 (default for vrf one)
> *>i1.1.1.6/32 1.1.1.4 0 100 0 64513 ?
> *>i172.16.2.0/30 1.1.1.4 0 100 0 64513 ?
> Total number of prefixes 2
>
> *Sh ip route on PE1*
>
> PE1#sh ip route vrf one
> Routing Table: one
> Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> E1 - OSPF external type 1, E2 - OSPF external type 2
> i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
> ia - IS-IS inter area, * - candidate default, U - per-user static
> route
> o - ODR, P - periodic downloaded static route
> Gateway of last resort is not set
> 1.0.0.0/32 is subnetted, 2 subnets
> B 1.1.1.5 [20/0] via 172.16.1.2, 00:22:14
> B 1.1.1.6 [200/0] via 1.1.1.4, 00:22:14
> 172.16.0.0/30 is subnetted, 2 subnets
> C 172.16.1.0 is directly connected, FastEthernet1/0
> B 172.16.2.0 [200/0] via 1.1.1.4, 00:22:14
> PE1#
>
> *Here is PE1 config*
>
> PE1#sh run | b router bgp
> router bgp 64512
> no bgp default ipv4-unicast
> bgp log-neighbor-changes
> neighbor 1.1.1.4 remote-as 64512
> neighbor 1.1.1.4 update-source Loopback0
> !
> address-family ipv4
> neighbor 1.1.1.4 activate
> no auto-summary
> no synchronization
> exit-address-family
> !
> address-family vpnv4
> neighbor 1.1.1.4 activate
> neighbor 1.1.1.4 send-community extended
> exit-address-family
> !
> address-family ipv4 vrf one
> neighbor 172.16.1.2 remote-as 64513
> neighbor 172.16.1.2 activate
> no auto-summary
> no synchronization
> exit-address-family
>
>
> *CE verify*
> **
> CE1#sh ip route
> Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
> D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
> N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
> E1 - OSPF external type 1, E2 - OSPF external type 2
> i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
> ia - IS-IS inter area, * - candidate default, U - per-user static
> route
> o - ODR, P - periodic downloaded static route
> Gateway of last resort is not set
> 1.0.0.0/32 is subnetted, 1 subnets
> C 1.1.1.5 is directly connected, Loopback0
> 172.16.0.0/30 is subnetted, 1 subnets
> C 172.16.1.0 is directly connected, FastEthernet0/0
>
> Please adivce.
> Regards
>
>
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